Always include FixtureKit::RSpec instance methods

lib/fixture_kit/rspec.rb

@@ -52,7 +52,7 @@ def self.configure!(config)
       FixtureKit.runner.configuration.adapter(FixtureKit::RSpecAdapter)
 
       config.extend ClassMethods
-      config.include InstanceMethods, DECLARATION_METADATA_KEY
+      config.include InstanceMethods
 
       # Load declared fixtures at the beginning of each example.
       # Runs inside transactional fixtures and before user-defined before hooks.

spec/dummy/spec/integration/fixture_kit_integration.rb

@@ -176,4 +176,17 @@ module FixtureKitIntegrationTimeHelpers
       puts "FKIT_ASSERT:ANONYMOUS_DUPLICATE_DECLARATION"
     end
   end
+
+  describe "fixture instance reader without declaration" do
+    it "raises a helpful error message" do
+      expect do
+        fixture
+      end.to raise_error(
+        RuntimeError,
+        "No fixture declared for this example group. Use `fixture \"name\"` in your describe/context block."
+      )
+
+      puts "FKIT_ASSERT:UNDECLARED_FIXTURE_READER"
+    end
+  end
 end

spec/dummy/test/integration/fixture_kit_integration_test.rb

@@ -156,3 +156,15 @@ class FixtureKitAnonymousDuplicateDeclarationIntegrationTest < ActiveSupport::Te
     puts "FKIT_ASSERT:ANONYMOUS_DUPLICATE_DECLARATION"
   end
 end
+
+class FixtureKitUndeclaredFixtureReaderIntegrationTest < ActiveSupport::TestCase
+  test "raises a helpful error message when fixture is called without declaration" do
+    error = assert_raises(RuntimeError) { fixture }
+
+    assert_equal(
+      "No fixture declared for this test class. Use `fixture \"name\"` in your test class.",
+      error.message
+    )
+    puts "FKIT_ASSERT:UNDECLARED_FIXTURE_READER"
+  end
+end

spec/integration/dummy_app_spec.rb

@@ -69,7 +69,8 @@ def run_dummy_tests
       "FKIT_ASSERT:ANONYMOUS_CACHE_PATH",
       "FKIT_ASSERT:ANONYMOUS_HELPER_METHODS",
       "FKIT_ASSERT:ANONYMOUS_NESTED_OVERRIDE",
-      "FKIT_ASSERT:ANONYMOUS_DUPLICATE_DECLARATION"
+      "FKIT_ASSERT:ANONYMOUS_DUPLICATE_DECLARATION",
+      "FKIT_ASSERT:UNDECLARED_FIXTURE_READER"
     ]
 
     expected_markers.each do |marker|